Transparent Electrode with Segmented Conductive Layers for Switchable Cells
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Solution Overview
Problem
Existing electrochromic switchable transparencies face limitations in achieving uniform current distribution, solar protection, and handling due to the characteristics of their transparent electrodes, which affect switching speed and temperature variations.
Innovation Solution
The design incorporates a pair of electrode assemblies with a high electrical resistance connecting layer and electrically conductive layers, including a zinc stannate layer, zinc oxide layer, and a silver film, to enhance current flow and heating capabilities while maintaining transparency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent electrode is used in an electrochromic switchable transparency, then visible light transmission is maintained, but current distribution uniformity and switching speed are limited
Solution Approach 1:
The transparent electrode is divided into multiple separate transparent conductive layers (first transparent conductive layer, second transparent conductive layer, third transparent conductive layer) positioned at different depths. This segmentation allows each layer to contribute differently to current distribution while maintaining overall transparency, resolving the contradiction between light transmission and switching speed.
Solution Approach 2:
The patent introduces a vertical dimension by positioning conductive layers at different depths within the electrode structure rather than using a single planar layer. This three-dimensional arrangement enables improved current distribution uniformity while maintaining visible light transmission, thereby enhancing switching speed without sacrificing transparency.
2Ease of manufacture
If the electrode structure is simplified, then manufacturing is easier, but solar protection and heating capabilities are reduced
Solution Approach 1:
The multi-layer transparent conductive structure serves multiple functions simultaneously: it provides electrical conductivity for switching, maintains visible light transmission for transparency, and enables solar protection and heating capabilities through its layered configuration. This multi-functionality resolves the contradiction between manufacturing simplicity and functional performance.
Solution Approach 2:
The electrode employs a composite structure combining multiple transparent conductive materials (such as indium tin oxide, fluorine-doped tin oxide, or zinc oxide-based conductive layers) arranged in sequence. This composite approach enhances solar protection and heating capabilities while maintaining manufacturability through established deposition techniques.
3Device complexity
If a single-layer transparent conductive coating is used, then the structure is simpler, but current distribution uniformity is insufficient
Solution Approach 1:
The single conductive layer is segmented into multiple transparent conductive layers positioned at different depths. Each layer contributes to the overall current distribution, and their combined effect achieves uniform current distribution across the electrode surface, resolving the contradiction between structural simplicity and current distribution uniformity.
Solution Approach 2:
The intermediate transparent conductive layers act as mediators between the external electrical connection and the electrochromic medium. These intermediary layers facilitate uniform current distribution by distributing electrical fields more evenly across the electrode, thereby improving reliability without significantly increasing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves switching speed, enhances solar protection, and allows for efficient heating of surfaces, addressing the limitations of existing technologies by providing a more robust and efficient electrochromic switchable transparency system.
Implementation Method 1
a zinc stannate layer, zinc oxide layer, and a silver film, to enhance current flow and heating capabilities
Implementation Method 2
when the electrodes are electrically energized, an electrical potential is applied to the electrochromic medium and causes the medium to change color
Data Source
AI summary
An electrochromic switchable transparency, e.g. a window and/or a mirror includes an electrochromic switchable medium between a pair of electrode assemblies. At least one of the electrode assemblies is transparent to visible light and includes an electrode over a surface. In one nonlimiting embodiment of the invention, the electrode has two electrically conducting layers and a bridging layer between and interconnecting the two electrically conducting layers. In one nonlimiting embodiment, the bridging layer includes a high electrically resistance connecting layer to provide the electrode with a heating layer to heat the surface and/or a current conducting layer to pass current to the medium. In another nonlimiting embodiment, the bridging layer includes an electrically connecting layer to pass current to electrically enhance the first electrically conductive layer. In another nonlimiting embodiment, the electrically conducting layers are silver films to reduce infrared transmission through the first electrode assembly.